Brake fuse warning circuit

A warning circuit for a vehicle brake system having a battery-powered source of brake actuation fluid pressure, having electrical control circuitry for controlling and monitoring the brake system and having a fuse connected between the battery and the control circuitry for protecting the control circuitry from a short circuit to ground condition, the warning circuit comprising:

• warning means for producing a warning signal to be recognized by a vehicle operator;
• a controlled switch device;
• an astable multivibrator device;
• first means for coupling one of the devices with the vehicle battery via the fuse;
• second means for coupling the other device with the warning means;
• and
• third means for coupling the devices with each other, the devices cooperating to intermittently actuate the warning means in response to an open circuit condition of the fuse.

A warning circuit for a vehicle with a brake system and with an engine started by an ignition switch, the brake system having a battery-powered source of brake actuation fluid pressure, electrical control circuitry for controlling and monitoring the brake system and a fuse connected between the battery and the control circuitry for protecting the control circuitry from a short circuit to ground condition, the warning circuit comprising:

• a current actuated warning device with first and second terminals;
• means for coupling the first terminal with the battery via the ignition switch;
• controlled switch means for coupling the second terminal with ground in response to signals applied to an input of the controlled switch means;
• an astable multivibrator with an input and an output;
• means for coupling the multivibrator output with the input of the output of said controlled switch means;
• and
• means for coupling the multivibrator input with the battery via the fuse, the multivibrator generating an intermittent signal at the output thereof in response to an open circuit condition of the fuse, the controlled switch means intermittently allowing current to flow through and actuate the warning device in response to the intermittent signals when the ignition switch is closed.